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. 2021 May 8;9:e00199. doi: 10.1016/j.ohx.2021.e00199
Designator Component Number Cost per unit (€) Total cost(€) Source of materials Material type
Stepper motor, CNC shield and limits switches CNC Kit 1 45€ 45€ https://www.aliexpress.com/item/33039557882.html Other
ESP32 Uno ESP32 1 3€ 3€ https://www.aliexpress.com/item/33052923558.html Other
Neopixel LEDs WS2812B 1 m 30 IP30 1 m (only three LEDs will be cut from the 1 m strip) 1€ 1€ https://www.aliexpress.com/item/32682015405.html Other
3D printer filament (PETG, ABS, PC or PLA) Prusament 1 30€ 30€ https://shop.prusa3d.com/en/prusament/801-prusament-petg-prusa-orange-1kg.html Polymer
Epoxy glue Epoxy 1 1.5€ 1.5€ https://hobbyking.com/en_us/hobbyking-4–6min-epoxy-glue.html Polymer
M4X20 (screws + nuts) M4X20 3 0.15€ 0.45€ Hardware store Other
M4X20 (screws + nuts) M4X25 4 0.15€ 0.6€ Hardware store Other
M3X15 (screws + nuts) M3X15 2 0.08€ 0.16€ Hardware store Other
M3X10 (screws + nuts) M3X10 1 0.08€ 0.16€ Hardware store Other
M8 threaded rod M8 1 0.5€ 0.5€ Hardware Store Other
Ball bearings 624ZZ 4x13x5mm Ball bearings 6 0.4€ 2.4€ https://www.aliexpress.com/item/32903042053.html Other
Raspberry Pi Zero W Single Board Computer 1 11.5€ 11.5€ https://www.kiwi-electronics.nl/raspberry-pi/raspberry-pi-zero/pi-zero-boards-packs/raspberry-pi-zero-w Other
Orange Pi Zero Single Board Computer 1 10.85€ 10.85€ https://aliexpress.com/item/4000049806939.html Other